potential here although brooding in tone it has some nice linework emerging and as Jumper mentioned there is a sense of depth indication. It is like an opening to somewhere. I think the window needs to be played up.
Not excited about the brown but could be a good under toning. I am seeing the brown surround in terms of a truncated pyramid as you would be looking down on it and through the window if that makes any sense to you. I'd pass over my eyeballs so you could look through them but I'm confident yours are just as good as mine! LOL
jumping over the design blocker wall is always fun!
Acrylic, oils? What size are you working on?